<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<a id="link">index.html</a>
<div id="btn1" style="width:100px; height: 50px;"></div>

<script>
    {
        document.getElementById('link').addEventListener('click', function () {
            window.setTimeout(function () {
                window.location = 'index.html?delay=2000';
            }, 900);
        });

        const btn1 = document.getElementById('btn1');

        btn1.addEventListener('click', function () {
            btn1.innerHTML = 'Hey ya!';
        });
    }
</script>
</body>
</html>
